He's conquered some of the world's harshest deserts. Now extreme racer Derek Kwik Kwok-tsan will attempt to be the first Chinese person to run across the Amazon. He will begin his seven-day trek across 200km of Brazil's rainforest today. The torturous course includes old logging trails, leech-filled rivers and 'primary jungle'. 'Primary jungle is where the canopy is so dense, sunlight never touches the ground,' Kwik said. 'This race is very dangerous and, quite honestly, this is the first time I have ever been truly scared.' That's because in addition to heat, humidity and rain, he might also have to contend with fire ants, piranhas, mosquitoes, poisonous snakes, wild pigs, jaguars and crocodiles. Guess what charity Kwik is running for: the Society for the Prevention of Cruelty to Animals. 'I am very comfortable in humidity, born and raised in Hong Kong. I have been running around for hours at a time with a 16kg bag of rice in a backpack. I affectionately call it Mini-Me. My friend arranged a boat trip in Tai Tam the other day. I skipped the boat ride, ran to Tai Tam from Causeway Bay, boarded the boat and ate lunch, then ran back home. 'This certainly does go beyond sports for me. In my day job, I am a managing partner of a venture capital firm. In life, I strongly believe you must also take calculated risks or you will never succeed.'